The track is divided into three sectors, and each of those is broken down into mini sectors. The media will generally display and refer to Sectors 1, 2 & 3. 

As the car completes a lap, its progress is reported against the sectors, and as each is completed, it will light up in yellow, green or purple. 

A yellow sector shows that the driver has completed the sector with no improvement on previous times recorded. 

Andrew Burden

The author Kiwi F1 Fan